Add javadoc docstrings to coppercore

[jkleiber]

Summary When publishing to maven in #39 we want to produce decent docs so we can use our own code (and so others can too if they want)

The objective of this ticket is to add docstrings to each class, method, and class member variable so the output of ./gradlew publishToMavenLocal produces no spam related to having no docstrings

Work Required

• [ ] Docstrings are added throughout the project

Verification

• ./gradlew publishToMavenLocal produces no spam related to having no docstrings
• Show the generated javadocs

[jkleiber]

@aidnem can you assign this to one of the new members?

[aidnem]

@jkleiber there are a ton of comments that need to be added, could we split this between Samson and Josh? We could give each one a few modules to do to even out the load.

[jkleiber]

@aidnem works for me